Implications of a positive cosmological constant for general relativity
Résumé
Most of the literature on general relativity over the last century assumes that the cosmological constant $\Lambda$ is zero. However, by now independent observations have led to a consensus that the dynamics of the universe is best described by Einstein’s equations with a small but positive $\Lambda$ . Interestingly, this requires a drastic revision of conceptual frameworks commonly used in general relativity, no matter how small $\Lambda$ is. We first explain why, and then summarize the current status of generalizations of these frameworks to include a positive $\Lambda$ , focusing on gravitational waves.
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